It certainly is strange the way they do roadwork sometimes.
First ... they dug up about a mile or more along my commute, deep enough that you could barely see the top of the equipment in the trenches. Once they had the trenches all dug. They covered them back in. Of course, one thought they were done.
Nope. They brought in these huge concrete culverts and stashed them along the road, then started digging the trenches again. That all took something like six months.
Then toward the end of that construction, they started in a few blocks from my apartment and tore up the streets for about a mile. That one involved detours and it took them about three months. They'd reopen a street, then close it the next day so you never knew when you were going to need to detour. Of course, you also didn't know you were going to need to detour until you got to the closed street, then either had to detour onto City Ave or turn around. Since City Ave is a street of last resort, I turned around. Only to discover yet more haphazard street closures.
In the meantime, on the other end of my commute, they have been replacing the Vine Street Expressway bridges. The Vine Street Expressway goes under the Ben Franklin Parkway, which is a major commuting street. So ... three lanes of traffic was often down to one lane. Construction and Parkway closures started March 2015 with construction halted for the Pope's visit. Not that that made my commute any easier, since they closed the Parkway and all possible side streets for the Pope's visit. Construction is expected to be complete November 2018.
Mind you ... before they started the bridge replacement, they tore up the Parkway to repave and put in new curbing, sidewalks, blah, blah, blah.
So for three years or more, there have been major delays as I try to get to work and back home.